Anchor rivet



Feb. 29, 1944. R, H GlLL y y 2,343,143

ANCHOR RIVET Filed OCT.. 21, 1942 Patented Feb. 29, 1944 Goodrich Company,v New poration of New York:` V K n 1,'14'2, 'serial No. 452,777 t n v n g 9 claims. (ci. ias- 2.4) I This invention relates to rivets l.and is useful Application october z in blind riveting and especially for anchoring. in apertures in bodies of deep material.

For some applications in the structures to vbodies of non-metallic materials such as plastics, wood, and." other fibrous mate-y rials, the prior expedients such as nail and lscrew fastening have in many cases been impractical,

as, for example, where the materialA has been structurally weak or where the body has been subject to undue vibration. Also, pwhere access fastening of I beinganchored in an aperture in deep material f 2I,-;such as plastics, ber board or wood, but

has been possible only at one side of the work,

and where the bodies have had walls ofcon- 'siderable depth, the problem has been aggravated. f

lYork, N.A Y., a. cor'- rig. sgis e view nre Fig. 2 showing a'V modification of the rivet, and

y Fig. 6 isy a view like Fig. 1` showing a further modification ofthe rivet. n

In the illustrative embodiment of the invention shown in Figs. 1 and 2, a rivet I0 capable of which may also be used to secure thinner pieces of materialtogether, comprisesa vcontinuously annular cylindrical body I I having a flanged end .I2 and a-bore I3 extending therethrough,.and

may be made of aluminum or copper alloy, steel or otherV suitable material which is harder than Furthermore, prior nails and screw fastenersl have not been entirely suitable for repeated attachment and detachment of the structures at vthe same position each time to the bodies; inasmuch as such fasteners have quickly lost` their vability to reengage with the materialonce they have beenremoved from the aperture therein.

-The principal objects ofthe invention are to provide effectively for anchoring a fastener. 'in deep material; to provide an improved rivetanchor for the purpose; to provide for-expanding the wall of the rivet-body at a. predetermined region while providing for resisting collapse of the wall of the'remainder of the body; to provide for preventing rotation of the rivet in the aperture; to provide for repeated attachment and detachment of a lstructure to the body even though assembly can be effected from only one .n side oi' the wall ofy the body; and to provide forA simplicity of construction and convenience of asf sembly and operation and manufacture.'

'I'hese and other objects and advantages of the invention will be apparent from the following description. l

In the accompanying drawing which forms a part of this specification. and inv which like numerals are employed to designate like parts throughout the same;

Fig. 1 is a perspective view of an anchor rivet constructed in accordance with and embodying the invention,

Fig. 211s a sectional view taken along the longitudinal axis of the rivet shown in Fig. l,

. Fig. 3 is a sectional view takenalong'line 3 3 0f Fig. 2, p

Fig. 4 isa view of the rivet anchored inan aperture in deep material, parts being in section,

.f the material which the rivet I0 engages but which is adequately ductile. For some applicationsa frusta-conical or countersunk shape of flanged end I2 as shown in Fig. 1, is preferable, but other shapes may ble provided for other conditions of usage. f y

Preferably, the borey I3 is of `substantially uniform` diameter and terminates in an internally threaded portion I4 for engaging a threaded tool I5, as' shown especially in Fig. 4. The bore I3 has `a greater diameter than thezthreaded portion I4`.to permit the tool I5 to slide into the VKrivet I0 from the flanged end I2, and to provide fork greater lwall thickness of the body II in the region of the threaded `portion I4.' Y

'Ihe cylindrical body II comprises an end portion Iliy including thethreaded ortion I4 and a v shank I1 including an expansi le or outwardly collapsible'portion `I8 and a portion I9 having a plurality of circumferentially.spacedvapara'lintegral,` stiifening ribs 20 kextending axially from the flange I2 to theexpansible vportion I8. lThe portion. IGhas a flat, open end.. A

The stiifening'ribs 20 extending axially along the portion I9 of thek shank Il are .triangular in section and are adapted to biteinto thematerial 2| when the rivet IIlvis forced into the aperture. However, other desirable shapes, such as d square and rectangular, may be used for stiftening and-strengthening thewall of the portion I9, thus `eilectively preventing collapse of this portionof1the wall while permitting expansion of theexpansible portion I8. A1so,`when the rivet Ill is anchored inthe aperture, as shown in Fig. 4,

` l' and a threaded tool forexpa'ndin'g the body of the rivet and an attaching screw beingshown in n dotted linesin the engaged position,

these ribs 2li are embeddedin the material 2l, hence preventing rotation of the rivet I0 duringv repeated-*engagement and disengagement of a threaded element '26 for attaching with` the threaded end I6 of the rivet. l M

, Asan illustrative example of the operation of the rivet I0, a suitably sized aperture 2i is bored in deep material, for example, a wood beam, to an extent sufllcient to accommodate the rivet. Prior to insertion of the rivet Ill, the threaded tool I5 is inserted from the ilanged end l2 of the rivet and engaged with the threaded end portion I6, after which the rivet III is inserted and driven into the aperture 25 until the flanged end I2 is flush with the surface of the wood. `In this manner the stiiening ribs 2D are embedded in the wood hence preventing rotation of the rivet I0, when the tool I5 is disengaged and withdrawn, as well as when the rivet is engaged and disengaged subsequently by the threaded element 26. If desired, the rivet may be inserted in the aperture prior to engaging the tool with the rivet.v

After the rivet I has been seated in the aperture 25, a suitable holding implement is posi" tioned so as to retain the rivet in placewhile axial force is being applied to the tool Iv in a` manner to cause expansion of the expansible portion I8 of the shank I6, while the stiffening ribs prevent collapsing of the Wall of the portion I9. When the portion I8 has been expandedinto tight engagement with the material 2|, the tool I5 is disengaged from the threaded end I6 and withdrawn from the bore I3 at thev flanged end I2 of the rivet I0, the'rivet now being anchored securely in the aperture 25.

A structure, such as a radio or an instrument cabinet, maybe attached separably to a wallby means vof athr'eaded element 26 engaging with' the threaded end I6 of the rivet I0, and the rivet will not loosen nor rotate within the Aaperture during repeated engagements and disengage-y mentsof the threaded attaching element."

nFor some applications, such as in dense, hard material like oak, the embodiment of Fig. 5 having a closed end 22 may be desirable. The closedend 22 may, if desired, have a tapered,

rounded, iiat, or other suitably shaped tip 23 for driving into the material 2l. The aperture 25 in the material may be bored to a lesserdepth than that required by the rivet I0... The rivet 30 is not vengaged by the tool I5 prior to being inserted' and driven into the 4aperture 25 such that the tapered driving tip 23Ypenetrates the wood, The resistance of the wood to penetration by the tip 23 causes the expansion of the 'expansible portion I8 thus anchoring the" rivet 30 in the aperture 25, and the stiiening ribs 20 prevent collapsing of the wall ofthe portion i9 and prevent rotating of vthe rivet 30 -in'the aperture. If insufficient expansion of the expansible `portion I8 is secured during the driving operation, the tool I5 may be engaged with the threaded end 22 and axial pressure applied, as described hereinabove, to complete the expansion to the desired extent for firmly anchoring 'the rivet 30 in the aperture 25. The tool is then disengaged from the rivet 30 and yWithdrawn from the bore I3 at the flanged end I2.

In the modified rivet l0 as shown in Fig. 6, stiiiening ribs 2l, preferably triangular in elevation and in section, vextend axiallyl along the frusto-conical flanged end I2 and continue along in the material may be like that described hereinabove for the rivet I0, or in the case where the rivet 40 is to be used in thinner material, for

example material of the depth of the ribs 24 a hole |of the diameter of the portion I8 may be provided and the ribs maybe forced into the material during the operation of upsetting the expansible portion as a result of the axial force on the rivet, thereby minimizing distortion of the material while providing a strong anchorage. Variations may be madev without departing from the scopeof the invention as it is deiined in the following claims.

I claim:

1. A fastener for anchorage in an aperture, said fastener comprising a body having a flange at one end and having a bore extending into the b ody` vfrom the vanged end, said body comprising an end portion opposite said flanged end and a shank intermediate said flanged end and said end portion, said shank including an expansible portion and a. portion having stiffening-means resisting collapse of its Wall while permitting expansion of said expansible` portion, said stiftening means being between said expansible portion and said flanged end, and means at said end portion for separably engaging the fastener with an engaging memberinserted .in the bore from said flanged end.

2. A rivet 'for anchorage in an aperture, said `rivet comprising a. body having a flange at one end and having a bore'extending into the body from'the flanged end, said body comprising an `internally threaded end portion opposite said flanged end andra shank intermediate said flanged end and said threaded end portion, said shank including an expansible portion and a portion having stiffening elements extendingalong its wall for .resisting collapse of said wall while permitting expansion of said expansible portion.

3. A 4rivet for anchorage in an aperture, said rivet comprising a body having a'fiange at one end and `having a bore extending into the body from the flanged end, said body comprising an internally threaded end portion including a v tapering driving tip opposite said :Banged end and a shankintermediate said iianged end and said threaded endportion, saidshank including an expansible portionand a portion having stiffening elements. extending along its Wall for resisting collapseof said wall vwhile permitting expansion of saidexpansible portion.

'4'. A rivet for anchorage in an aperture, said rivet comprising body having a iiange at one end, said body having-a bore extending into the body from the iianged end and terminating in an internally threaded portion andV said body having stiifening elements extending along said body fromv said flange for resisting collapse of the wall of the rivet and terminating short of said threaded portion providing an outwardly collapsible portion of the wall-between said stiffening elements and said threaded portion.

5. A rivet for anchorage'irr an aperture in deep material, said rivet comprising a continuously annular cylindrical body of substantially uniform outside diameter throughout its length and a flange at oneend, said body having a bore of substantially'uniform diameter extending into the body from the flanged end and terminating in a threaded portion for engaging a threaded member inserted in the bore from the flanged end of the rivet, and said body including an expansible portion for embedding in said material and a portion having a plurality of circumferentially spaced-apart, stiiening elements extending axially short of the length of the body for resisting collapse of its Wall while permitting expansion A l resisting collapse of its wall while permitting of said expansible portion.

6. A rivet for anchorage in an aperture in deep material, said rivet comprising a, continuously annular cylindricalbody having a flange at one end and having a bore of substantially uniform diameter extending therethrough, said body comprising an internally threaded end portion opposite said flanged end and a shank between said flanged end and said threaded end, said shank including an expansible portion adjacent said threaded end and a portion having a plurality of circumferentially spaced-apart, integral ribs triangular in section, said ribs extending axially along said portion from said anged end for resisting collapse of its Wall while permitting expansion of said expansible portion and for resisting rotation of the rivet in said aperture.

7. A rivet for anchorage in an aperture in deep material, said rivet comprising .a 'continuously annular cylindrical body having a, flange at one end and having a bore of substantially uniform `diameter .extending into the body from the hanged end and terminating in a threaded portion, said body comprising an end portion including said threaded portionv and having a tapering driving tip and a shank connecting said flanged end and said end portion, said shank including an expansible `portion adjacent said end portion and a portion having a plurality of circumferentially spaced-apart, integral ribs triangular in section, said ribs` extending axially along said portion from said anged end for expansion of said expansible portion and for resisting rotation ofthe rivet in said aperture.

8. A rivet for anchorage in deep material, said said end and having stiiening projectionsl on said shank adjacent said expansible portion for limiting the extent of collapse of the Wall of said shank to said expansible portion, and means at said member-engaging portion for separably engaging 'the rivet'with an engaging member inl extending from said threaded portion toward said end, said shank including an expansible portion extending from said threaded portion toward said end, and circumferentially spaced-apart stiiening ribs extending axially along said shank from said expansible portion toward said end for resisting collapse of the wall thereof while permitting expansion of said expansible portion.

v RAY H. GIIL. 

